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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
fd38203a LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <sys/epoll.h> | |
22 | #include <sys/timerfd.h> | |
23 | #include <sys/wait.h> | |
24 | ||
cde93897 | 25 | #include "sd-daemon.h" |
07630cea LP |
26 | #include "sd-event.h" |
27 | #include "sd-id128.h" | |
28 | ||
b5efdb8a | 29 | #include "alloc-util.h" |
3ffd4af2 | 30 | #include "fd-util.h" |
fd38203a | 31 | #include "hashmap.h" |
07630cea LP |
32 | #include "list.h" |
33 | #include "macro.h" | |
afc6adb5 | 34 | #include "missing.h" |
07630cea | 35 | #include "prioq.h" |
4a0b58c4 | 36 | #include "process-util.h" |
6e9feda3 | 37 | #include "set.h" |
24882e06 | 38 | #include "signal-util.h" |
55cbfaa5 | 39 | #include "string-table.h" |
07630cea LP |
40 | #include "string-util.h" |
41 | #include "time-util.h" | |
42 | #include "util.h" | |
fd38203a | 43 | |
c2ba3ad6 | 44 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
45 | |
46 | typedef enum EventSourceType { | |
47 | SOURCE_IO, | |
6a0f1f6d | 48 | SOURCE_TIME_REALTIME, |
a8548816 | 49 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
50 | SOURCE_TIME_MONOTONIC, |
51 | SOURCE_TIME_REALTIME_ALARM, | |
52 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
53 | SOURCE_SIGNAL, |
54 | SOURCE_CHILD, | |
da7e457c | 55 | SOURCE_DEFER, |
6e9feda3 | 56 | SOURCE_POST, |
6203e07a | 57 | SOURCE_EXIT, |
6a0f1f6d | 58 | SOURCE_WATCHDOG, |
a71fe8b8 | 59 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 60 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
61 | } EventSourceType; |
62 | ||
55cbfaa5 DM |
63 | static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = { |
64 | [SOURCE_IO] = "io", | |
65 | [SOURCE_TIME_REALTIME] = "realtime", | |
66 | [SOURCE_TIME_BOOTTIME] = "bootime", | |
67 | [SOURCE_TIME_MONOTONIC] = "monotonic", | |
68 | [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm", | |
69 | [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm", | |
70 | [SOURCE_SIGNAL] = "signal", | |
71 | [SOURCE_CHILD] = "child", | |
72 | [SOURCE_DEFER] = "defer", | |
73 | [SOURCE_POST] = "post", | |
74 | [SOURCE_EXIT] = "exit", | |
75 | [SOURCE_WATCHDOG] = "watchdog", | |
76 | }; | |
77 | ||
78 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int); | |
79 | ||
9da4cb2b LP |
80 | /* All objects we use in epoll events start with this value, so that |
81 | * we know how to dispatch it */ | |
82 | typedef enum WakeupType { | |
83 | WAKEUP_NONE, | |
84 | WAKEUP_EVENT_SOURCE, | |
85 | WAKEUP_CLOCK_DATA, | |
86 | WAKEUP_SIGNAL_DATA, | |
87 | _WAKEUP_TYPE_MAX, | |
88 | _WAKEUP_TYPE_INVALID = -1, | |
89 | } WakeupType; | |
90 | ||
a8548816 | 91 | #define EVENT_SOURCE_IS_TIME(t) IN_SET((t), SOURCE_TIME_REALTIME, SOURCE_TIME_BOOTTIME, SOURCE_TIME_MONOTONIC, SOURCE_TIME_REALTIME_ALARM, SOURCE_TIME_BOOTTIME_ALARM) |
6a0f1f6d | 92 | |
fd38203a | 93 | struct sd_event_source { |
9da4cb2b LP |
94 | WakeupType wakeup; |
95 | ||
da7e457c | 96 | unsigned n_ref; |
fd38203a LP |
97 | |
98 | sd_event *event; | |
99 | void *userdata; | |
718db961 | 100 | sd_event_handler_t prepare; |
fd38203a | 101 | |
356779df | 102 | char *description; |
f7f53e9e | 103 | |
6a0f1f6d | 104 | EventSourceType type:5; |
baf76283 | 105 | int enabled:3; |
fd38203a | 106 | bool pending:1; |
12179984 | 107 | bool dispatching:1; |
a71fe8b8 | 108 | bool floating:1; |
fd38203a | 109 | |
31927c16 | 110 | int64_t priority; |
fd38203a LP |
111 | unsigned pending_index; |
112 | unsigned prepare_index; | |
60a3b1e1 LP |
113 | uint64_t pending_iteration; |
114 | uint64_t prepare_iteration; | |
fd38203a | 115 | |
a71fe8b8 LP |
116 | LIST_FIELDS(sd_event_source, sources); |
117 | ||
fd38203a LP |
118 | union { |
119 | struct { | |
718db961 | 120 | sd_event_io_handler_t callback; |
fd38203a LP |
121 | int fd; |
122 | uint32_t events; | |
123 | uint32_t revents; | |
124 | bool registered:1; | |
125 | } io; | |
126 | struct { | |
718db961 | 127 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
128 | usec_t next, accuracy; |
129 | unsigned earliest_index; | |
130 | unsigned latest_index; | |
fd38203a LP |
131 | } time; |
132 | struct { | |
718db961 | 133 | sd_event_signal_handler_t callback; |
fd38203a LP |
134 | struct signalfd_siginfo siginfo; |
135 | int sig; | |
136 | } signal; | |
137 | struct { | |
718db961 | 138 | sd_event_child_handler_t callback; |
fd38203a LP |
139 | siginfo_t siginfo; |
140 | pid_t pid; | |
141 | int options; | |
142 | } child; | |
143 | struct { | |
718db961 | 144 | sd_event_handler_t callback; |
fd38203a | 145 | } defer; |
6e9feda3 LP |
146 | struct { |
147 | sd_event_handler_t callback; | |
148 | } post; | |
da7e457c | 149 | struct { |
718db961 | 150 | sd_event_handler_t callback; |
da7e457c | 151 | unsigned prioq_index; |
6203e07a | 152 | } exit; |
fd38203a LP |
153 | }; |
154 | }; | |
155 | ||
6a0f1f6d | 156 | struct clock_data { |
9da4cb2b | 157 | WakeupType wakeup; |
6a0f1f6d LP |
158 | int fd; |
159 | ||
160 | /* For all clocks we maintain two priority queues each, one | |
161 | * ordered for the earliest times the events may be | |
162 | * dispatched, and one ordered by the latest times they must | |
163 | * have been dispatched. The range between the top entries in | |
164 | * the two prioqs is the time window we can freely schedule | |
165 | * wakeups in */ | |
166 | ||
167 | Prioq *earliest; | |
168 | Prioq *latest; | |
169 | usec_t next; | |
212bbb17 TG |
170 | |
171 | bool needs_rearm:1; | |
6a0f1f6d LP |
172 | }; |
173 | ||
9da4cb2b LP |
174 | struct signal_data { |
175 | WakeupType wakeup; | |
176 | ||
177 | /* For each priority we maintain one signal fd, so that we | |
178 | * only have to dequeue a single event per priority at a | |
179 | * time. */ | |
180 | ||
181 | int fd; | |
182 | int64_t priority; | |
183 | sigset_t sigset; | |
184 | sd_event_source *current; | |
185 | }; | |
186 | ||
fd38203a | 187 | struct sd_event { |
da7e457c | 188 | unsigned n_ref; |
fd38203a LP |
189 | |
190 | int epoll_fd; | |
cde93897 | 191 | int watchdog_fd; |
fd38203a LP |
192 | |
193 | Prioq *pending; | |
194 | Prioq *prepare; | |
c2ba3ad6 | 195 | |
a8548816 | 196 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
197 | * can add support for more clocks when the kernel learns to |
198 | * deal with them, too. */ | |
199 | struct clock_data realtime; | |
a8548816 | 200 | struct clock_data boottime; |
6a0f1f6d LP |
201 | struct clock_data monotonic; |
202 | struct clock_data realtime_alarm; | |
203 | struct clock_data boottime_alarm; | |
fd38203a | 204 | |
da7e457c LP |
205 | usec_t perturb; |
206 | ||
9da4cb2b LP |
207 | sd_event_source **signal_sources; /* indexed by signal number */ |
208 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
209 | |
210 | Hashmap *child_sources; | |
baf76283 | 211 | unsigned n_enabled_child_sources; |
fd38203a | 212 | |
6e9feda3 LP |
213 | Set *post_sources; |
214 | ||
6203e07a | 215 | Prioq *exit; |
fd38203a | 216 | |
da7e457c | 217 | pid_t original_pid; |
c2ba3ad6 | 218 | |
60a3b1e1 | 219 | uint64_t iteration; |
e475d10c | 220 | triple_timestamp timestamp; |
da7e457c | 221 | int state; |
eaa3cbef | 222 | |
6203e07a | 223 | bool exit_requested:1; |
da7e457c | 224 | bool need_process_child:1; |
cde93897 | 225 | bool watchdog:1; |
34b87517 | 226 | bool profile_delays:1; |
afc6adb5 | 227 | |
6203e07a LP |
228 | int exit_code; |
229 | ||
afc6adb5 LP |
230 | pid_t tid; |
231 | sd_event **default_event_ptr; | |
cde93897 LP |
232 | |
233 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
234 | |
235 | unsigned n_sources; | |
a71fe8b8 LP |
236 | |
237 | LIST_HEAD(sd_event_source, sources); | |
34b87517 VC |
238 | |
239 | usec_t last_run, last_log; | |
240 | unsigned delays[sizeof(usec_t) * 8]; | |
fd38203a LP |
241 | }; |
242 | ||
a71fe8b8 LP |
243 | static void source_disconnect(sd_event_source *s); |
244 | ||
fd38203a LP |
245 | static int pending_prioq_compare(const void *a, const void *b) { |
246 | const sd_event_source *x = a, *y = b; | |
247 | ||
248 | assert(x->pending); | |
249 | assert(y->pending); | |
250 | ||
baf76283 LP |
251 | /* Enabled ones first */ |
252 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 253 | return -1; |
baf76283 | 254 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
255 | return 1; |
256 | ||
257 | /* Lower priority values first */ | |
258 | if (x->priority < y->priority) | |
259 | return -1; | |
260 | if (x->priority > y->priority) | |
261 | return 1; | |
262 | ||
263 | /* Older entries first */ | |
264 | if (x->pending_iteration < y->pending_iteration) | |
265 | return -1; | |
266 | if (x->pending_iteration > y->pending_iteration) | |
267 | return 1; | |
268 | ||
fd38203a LP |
269 | return 0; |
270 | } | |
271 | ||
272 | static int prepare_prioq_compare(const void *a, const void *b) { | |
273 | const sd_event_source *x = a, *y = b; | |
274 | ||
275 | assert(x->prepare); | |
276 | assert(y->prepare); | |
277 | ||
8046c457 KK |
278 | /* Enabled ones first */ |
279 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
280 | return -1; | |
281 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
282 | return 1; | |
283 | ||
fd38203a LP |
284 | /* Move most recently prepared ones last, so that we can stop |
285 | * preparing as soon as we hit one that has already been | |
286 | * prepared in the current iteration */ | |
287 | if (x->prepare_iteration < y->prepare_iteration) | |
288 | return -1; | |
289 | if (x->prepare_iteration > y->prepare_iteration) | |
290 | return 1; | |
291 | ||
fd38203a LP |
292 | /* Lower priority values first */ |
293 | if (x->priority < y->priority) | |
294 | return -1; | |
295 | if (x->priority > y->priority) | |
296 | return 1; | |
297 | ||
fd38203a LP |
298 | return 0; |
299 | } | |
300 | ||
c2ba3ad6 | 301 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
302 | const sd_event_source *x = a, *y = b; |
303 | ||
6a0f1f6d LP |
304 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
305 | assert(x->type == y->type); | |
fd38203a | 306 | |
baf76283 LP |
307 | /* Enabled ones first */ |
308 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 309 | return -1; |
baf76283 | 310 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
311 | return 1; |
312 | ||
313 | /* Move the pending ones to the end */ | |
314 | if (!x->pending && y->pending) | |
315 | return -1; | |
316 | if (x->pending && !y->pending) | |
317 | return 1; | |
318 | ||
319 | /* Order by time */ | |
320 | if (x->time.next < y->time.next) | |
321 | return -1; | |
322 | if (x->time.next > y->time.next) | |
a99badf5 | 323 | return 1; |
fd38203a | 324 | |
fd38203a LP |
325 | return 0; |
326 | } | |
327 | ||
1bce0ffa LP |
328 | static usec_t time_event_source_latest(const sd_event_source *s) { |
329 | return usec_add(s->time.next, s->time.accuracy); | |
330 | } | |
331 | ||
c2ba3ad6 LP |
332 | static int latest_time_prioq_compare(const void *a, const void *b) { |
333 | const sd_event_source *x = a, *y = b; | |
334 | ||
6a0f1f6d LP |
335 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
336 | assert(x->type == y->type); | |
c2ba3ad6 | 337 | |
baf76283 LP |
338 | /* Enabled ones first */ |
339 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 340 | return -1; |
baf76283 | 341 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
342 | return 1; |
343 | ||
344 | /* Move the pending ones to the end */ | |
345 | if (!x->pending && y->pending) | |
346 | return -1; | |
347 | if (x->pending && !y->pending) | |
348 | return 1; | |
349 | ||
350 | /* Order by time */ | |
1bce0ffa | 351 | if (time_event_source_latest(x) < time_event_source_latest(y)) |
c2ba3ad6 | 352 | return -1; |
1bce0ffa | 353 | if (time_event_source_latest(x) > time_event_source_latest(y)) |
a99badf5 | 354 | return 1; |
c2ba3ad6 | 355 | |
c2ba3ad6 LP |
356 | return 0; |
357 | } | |
358 | ||
6203e07a | 359 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
360 | const sd_event_source *x = a, *y = b; |
361 | ||
6203e07a LP |
362 | assert(x->type == SOURCE_EXIT); |
363 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 364 | |
baf76283 LP |
365 | /* Enabled ones first */ |
366 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 367 | return -1; |
baf76283 | 368 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
369 | return 1; |
370 | ||
371 | /* Lower priority values first */ | |
372 | if (x->priority < y->priority) | |
373 | return -1; | |
374 | if (x->priority > y->priority) | |
375 | return 1; | |
376 | ||
da7e457c LP |
377 | return 0; |
378 | } | |
379 | ||
6a0f1f6d LP |
380 | static void free_clock_data(struct clock_data *d) { |
381 | assert(d); | |
9da4cb2b | 382 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
383 | |
384 | safe_close(d->fd); | |
385 | prioq_free(d->earliest); | |
386 | prioq_free(d->latest); | |
387 | } | |
388 | ||
fd38203a | 389 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
390 | sd_event_source *s; |
391 | ||
fd38203a | 392 | assert(e); |
a71fe8b8 LP |
393 | |
394 | while ((s = e->sources)) { | |
395 | assert(s->floating); | |
396 | source_disconnect(s); | |
397 | sd_event_source_unref(s); | |
398 | } | |
399 | ||
15b38f93 | 400 | assert(e->n_sources == 0); |
fd38203a | 401 | |
afc6adb5 LP |
402 | if (e->default_event_ptr) |
403 | *(e->default_event_ptr) = NULL; | |
404 | ||
03e334a1 | 405 | safe_close(e->epoll_fd); |
03e334a1 | 406 | safe_close(e->watchdog_fd); |
cde93897 | 407 | |
6a0f1f6d | 408 | free_clock_data(&e->realtime); |
a8548816 | 409 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
410 | free_clock_data(&e->monotonic); |
411 | free_clock_data(&e->realtime_alarm); | |
412 | free_clock_data(&e->boottime_alarm); | |
413 | ||
fd38203a LP |
414 | prioq_free(e->pending); |
415 | prioq_free(e->prepare); | |
6203e07a | 416 | prioq_free(e->exit); |
fd38203a LP |
417 | |
418 | free(e->signal_sources); | |
9da4cb2b | 419 | hashmap_free(e->signal_data); |
fd38203a LP |
420 | |
421 | hashmap_free(e->child_sources); | |
6e9feda3 | 422 | set_free(e->post_sources); |
fd38203a LP |
423 | free(e); |
424 | } | |
425 | ||
f7262a9f | 426 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
427 | sd_event *e; |
428 | int r; | |
429 | ||
305f78bf | 430 | assert_return(ret, -EINVAL); |
fd38203a LP |
431 | |
432 | e = new0(sd_event, 1); | |
433 | if (!e) | |
434 | return -ENOMEM; | |
435 | ||
da7e457c | 436 | e->n_ref = 1; |
9da4cb2b | 437 | e->watchdog_fd = e->epoll_fd = e->realtime.fd = e->boottime.fd = e->monotonic.fd = e->realtime_alarm.fd = e->boottime_alarm.fd = -1; |
3a43da28 | 438 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
9da4cb2b | 439 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
df0ff127 | 440 | e->original_pid = getpid_cached(); |
3a43da28 | 441 | e->perturb = USEC_INFINITY; |
fd38203a | 442 | |
c983e776 EV |
443 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
444 | if (r < 0) | |
fd38203a | 445 | goto fail; |
fd38203a LP |
446 | |
447 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
448 | if (e->epoll_fd < 0) { | |
449 | r = -errno; | |
450 | goto fail; | |
451 | } | |
452 | ||
34b87517 | 453 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
34a6843d | 454 | log_debug("Event loop profiling enabled. Logarithmic histogram of event loop iterations in the range 2^0 ... 2^63 us will be logged every 5s."); |
34b87517 VC |
455 | e->profile_delays = true; |
456 | } | |
457 | ||
fd38203a LP |
458 | *ret = e; |
459 | return 0; | |
460 | ||
461 | fail: | |
462 | event_free(e); | |
463 | return r; | |
464 | } | |
465 | ||
f7262a9f | 466 | _public_ sd_event* sd_event_ref(sd_event *e) { |
6680dd6b LP |
467 | |
468 | if (!e) | |
469 | return NULL; | |
fd38203a | 470 | |
da7e457c LP |
471 | assert(e->n_ref >= 1); |
472 | e->n_ref++; | |
fd38203a LP |
473 | |
474 | return e; | |
475 | } | |
476 | ||
f7262a9f | 477 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
478 | |
479 | if (!e) | |
480 | return NULL; | |
fd38203a | 481 | |
da7e457c LP |
482 | assert(e->n_ref >= 1); |
483 | e->n_ref--; | |
484 | ||
485 | if (e->n_ref <= 0) | |
fd38203a LP |
486 | event_free(e); |
487 | ||
488 | return NULL; | |
489 | } | |
490 | ||
eaa3cbef LP |
491 | static bool event_pid_changed(sd_event *e) { |
492 | assert(e); | |
493 | ||
a2360a46 | 494 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
495 | * it around over a fork(). Let's complain. */ |
496 | ||
df0ff127 | 497 | return e->original_pid != getpid_cached(); |
eaa3cbef LP |
498 | } |
499 | ||
366e6411 | 500 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
501 | int r; |
502 | ||
503 | assert(s); | |
504 | assert(s->type == SOURCE_IO); | |
505 | ||
f6806734 | 506 | if (event_pid_changed(s->event)) |
366e6411 | 507 | return; |
f6806734 | 508 | |
fd38203a | 509 | if (!s->io.registered) |
366e6411 | 510 | return; |
fd38203a LP |
511 | |
512 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf | 513 | if (r < 0) |
55cbfaa5 DM |
514 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
515 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a LP |
516 | |
517 | s->io.registered = false; | |
fd38203a LP |
518 | } |
519 | ||
305f78bf LP |
520 | static int source_io_register( |
521 | sd_event_source *s, | |
522 | int enabled, | |
523 | uint32_t events) { | |
524 | ||
fd38203a LP |
525 | struct epoll_event ev = {}; |
526 | int r; | |
527 | ||
528 | assert(s); | |
529 | assert(s->type == SOURCE_IO); | |
baf76283 | 530 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
531 | |
532 | ev.events = events; | |
533 | ev.data.ptr = s; | |
534 | ||
baf76283 | 535 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
536 | ev.events |= EPOLLONESHOT; |
537 | ||
538 | if (s->io.registered) | |
539 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
540 | else | |
541 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
fd38203a LP |
542 | if (r < 0) |
543 | return -errno; | |
544 | ||
545 | s->io.registered = true; | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
6a0f1f6d LP |
550 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
551 | ||
552 | switch (t) { | |
553 | ||
554 | case SOURCE_TIME_REALTIME: | |
555 | return CLOCK_REALTIME; | |
556 | ||
a8548816 TG |
557 | case SOURCE_TIME_BOOTTIME: |
558 | return CLOCK_BOOTTIME; | |
559 | ||
6a0f1f6d LP |
560 | case SOURCE_TIME_MONOTONIC: |
561 | return CLOCK_MONOTONIC; | |
562 | ||
563 | case SOURCE_TIME_REALTIME_ALARM: | |
564 | return CLOCK_REALTIME_ALARM; | |
565 | ||
566 | case SOURCE_TIME_BOOTTIME_ALARM: | |
567 | return CLOCK_BOOTTIME_ALARM; | |
568 | ||
569 | default: | |
570 | return (clockid_t) -1; | |
571 | } | |
572 | } | |
573 | ||
574 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
575 | ||
576 | switch (clock) { | |
577 | ||
578 | case CLOCK_REALTIME: | |
579 | return SOURCE_TIME_REALTIME; | |
580 | ||
a8548816 TG |
581 | case CLOCK_BOOTTIME: |
582 | return SOURCE_TIME_BOOTTIME; | |
583 | ||
6a0f1f6d LP |
584 | case CLOCK_MONOTONIC: |
585 | return SOURCE_TIME_MONOTONIC; | |
586 | ||
587 | case CLOCK_REALTIME_ALARM: | |
588 | return SOURCE_TIME_REALTIME_ALARM; | |
589 | ||
590 | case CLOCK_BOOTTIME_ALARM: | |
591 | return SOURCE_TIME_BOOTTIME_ALARM; | |
592 | ||
593 | default: | |
594 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
595 | } | |
596 | } | |
597 | ||
598 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
599 | assert(e); | |
600 | ||
601 | switch (t) { | |
602 | ||
603 | case SOURCE_TIME_REALTIME: | |
604 | return &e->realtime; | |
605 | ||
a8548816 TG |
606 | case SOURCE_TIME_BOOTTIME: |
607 | return &e->boottime; | |
608 | ||
6a0f1f6d LP |
609 | case SOURCE_TIME_MONOTONIC: |
610 | return &e->monotonic; | |
611 | ||
612 | case SOURCE_TIME_REALTIME_ALARM: | |
613 | return &e->realtime_alarm; | |
614 | ||
615 | case SOURCE_TIME_BOOTTIME_ALARM: | |
616 | return &e->boottime_alarm; | |
617 | ||
618 | default: | |
619 | return NULL; | |
620 | } | |
621 | } | |
622 | ||
9da4cb2b LP |
623 | static int event_make_signal_data( |
624 | sd_event *e, | |
625 | int sig, | |
626 | struct signal_data **ret) { | |
4807d2d0 | 627 | |
f95387cd | 628 | struct epoll_event ev = {}; |
9da4cb2b LP |
629 | struct signal_data *d; |
630 | bool added = false; | |
631 | sigset_t ss_copy; | |
632 | int64_t priority; | |
f95387cd ZJS |
633 | int r; |
634 | ||
635 | assert(e); | |
636 | ||
f6806734 | 637 | if (event_pid_changed(e)) |
9da4cb2b | 638 | return -ECHILD; |
f6806734 | 639 | |
9da4cb2b LP |
640 | if (e->signal_sources && e->signal_sources[sig]) |
641 | priority = e->signal_sources[sig]->priority; | |
642 | else | |
643 | priority = 0; | |
f95387cd | 644 | |
9da4cb2b LP |
645 | d = hashmap_get(e->signal_data, &priority); |
646 | if (d) { | |
647 | if (sigismember(&d->sigset, sig) > 0) { | |
648 | if (ret) | |
649 | *ret = d; | |
650 | return 0; | |
651 | } | |
652 | } else { | |
653 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
654 | if (r < 0) | |
655 | return r; | |
656 | ||
657 | d = new0(struct signal_data, 1); | |
658 | if (!d) | |
659 | return -ENOMEM; | |
660 | ||
661 | d->wakeup = WAKEUP_SIGNAL_DATA; | |
662 | d->fd = -1; | |
663 | d->priority = priority; | |
664 | ||
665 | r = hashmap_put(e->signal_data, &d->priority, d); | |
90f604d1 ZJS |
666 | if (r < 0) { |
667 | free(d); | |
9da4cb2b | 668 | return r; |
90f604d1 | 669 | } |
f95387cd | 670 | |
9da4cb2b LP |
671 | added = true; |
672 | } | |
673 | ||
674 | ss_copy = d->sigset; | |
675 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
676 | ||
677 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
678 | if (r < 0) { | |
679 | r = -errno; | |
680 | goto fail; | |
681 | } | |
682 | ||
683 | d->sigset = ss_copy; | |
f95387cd | 684 | |
9da4cb2b LP |
685 | if (d->fd >= 0) { |
686 | if (ret) | |
687 | *ret = d; | |
f95387cd | 688 | return 0; |
9da4cb2b LP |
689 | } |
690 | ||
691 | d->fd = r; | |
f95387cd ZJS |
692 | |
693 | ev.events = EPOLLIN; | |
9da4cb2b | 694 | ev.data.ptr = d; |
f95387cd | 695 | |
9da4cb2b LP |
696 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
697 | if (r < 0) { | |
698 | r = -errno; | |
699 | goto fail; | |
f95387cd ZJS |
700 | } |
701 | ||
9da4cb2b LP |
702 | if (ret) |
703 | *ret = d; | |
704 | ||
f95387cd | 705 | return 0; |
9da4cb2b LP |
706 | |
707 | fail: | |
708 | if (added) { | |
709 | d->fd = safe_close(d->fd); | |
710 | hashmap_remove(e->signal_data, &d->priority); | |
711 | free(d); | |
712 | } | |
713 | ||
714 | return r; | |
715 | } | |
716 | ||
717 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
718 | assert(e); | |
719 | assert(d); | |
720 | ||
721 | /* Turns off the specified signal in the signal data | |
722 | * object. If the signal mask of the object becomes empty that | |
723 | * way removes it. */ | |
724 | ||
725 | if (sigismember(&d->sigset, sig) == 0) | |
726 | return; | |
727 | ||
728 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
729 | ||
730 | if (sigisemptyset(&d->sigset)) { | |
731 | ||
732 | /* If all the mask is all-zero we can get rid of the structure */ | |
733 | hashmap_remove(e->signal_data, &d->priority); | |
9da4cb2b LP |
734 | safe_close(d->fd); |
735 | free(d); | |
736 | return; | |
737 | } | |
738 | ||
739 | assert(d->fd >= 0); | |
740 | ||
741 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
742 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
743 | } | |
744 | ||
745 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
746 | struct signal_data *d; | |
747 | static const int64_t zero_priority = 0; | |
748 | ||
749 | assert(e); | |
750 | ||
751 | /* Rechecks if the specified signal is still something we are | |
752 | * interested in. If not, we'll unmask it, and possibly drop | |
753 | * the signalfd for it. */ | |
754 | ||
755 | if (sig == SIGCHLD && | |
756 | e->n_enabled_child_sources > 0) | |
757 | return; | |
758 | ||
759 | if (e->signal_sources && | |
760 | e->signal_sources[sig] && | |
761 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
762 | return; | |
763 | ||
764 | /* | |
765 | * The specified signal might be enabled in three different queues: | |
766 | * | |
767 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
768 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
769 | * 3) the 0 priority (to cover the SIGCHLD case) | |
770 | * | |
771 | * Hence, let's remove it from all three here. | |
772 | */ | |
773 | ||
774 | if (priority) { | |
775 | d = hashmap_get(e->signal_data, priority); | |
776 | if (d) | |
777 | event_unmask_signal_data(e, d, sig); | |
778 | } | |
779 | ||
780 | if (e->signal_sources && e->signal_sources[sig]) { | |
781 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
782 | if (d) | |
783 | event_unmask_signal_data(e, d, sig); | |
784 | } | |
785 | ||
786 | d = hashmap_get(e->signal_data, &zero_priority); | |
787 | if (d) | |
788 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
789 | } |
790 | ||
a71fe8b8 LP |
791 | static void source_disconnect(sd_event_source *s) { |
792 | sd_event *event; | |
793 | ||
fd38203a LP |
794 | assert(s); |
795 | ||
a71fe8b8 LP |
796 | if (!s->event) |
797 | return; | |
15b38f93 | 798 | |
a71fe8b8 | 799 | assert(s->event->n_sources > 0); |
fd38203a | 800 | |
a71fe8b8 | 801 | switch (s->type) { |
fd38203a | 802 | |
a71fe8b8 LP |
803 | case SOURCE_IO: |
804 | if (s->io.fd >= 0) | |
805 | source_io_unregister(s); | |
fd38203a | 806 | |
a71fe8b8 | 807 | break; |
6a0f1f6d | 808 | |
a71fe8b8 | 809 | case SOURCE_TIME_REALTIME: |
a8548816 | 810 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
811 | case SOURCE_TIME_MONOTONIC: |
812 | case SOURCE_TIME_REALTIME_ALARM: | |
813 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
814 | struct clock_data *d; | |
fd38203a | 815 | |
a71fe8b8 LP |
816 | d = event_get_clock_data(s->event, s->type); |
817 | assert(d); | |
818 | ||
819 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
820 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 821 | d->needs_rearm = true; |
a71fe8b8 LP |
822 | break; |
823 | } | |
824 | ||
825 | case SOURCE_SIGNAL: | |
826 | if (s->signal.sig > 0) { | |
9da4cb2b | 827 | |
a71fe8b8 LP |
828 | if (s->event->signal_sources) |
829 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 830 | |
9da4cb2b | 831 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 832 | } |
fd38203a | 833 | |
a71fe8b8 | 834 | break; |
fd38203a | 835 | |
a71fe8b8 LP |
836 | case SOURCE_CHILD: |
837 | if (s->child.pid > 0) { | |
838 | if (s->enabled != SD_EVENT_OFF) { | |
839 | assert(s->event->n_enabled_child_sources > 0); | |
840 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 841 | } |
fd38203a | 842 | |
4a0b58c4 | 843 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 844 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 845 | } |
fd38203a | 846 | |
a71fe8b8 | 847 | break; |
fd38203a | 848 | |
a71fe8b8 LP |
849 | case SOURCE_DEFER: |
850 | /* nothing */ | |
851 | break; | |
fd38203a | 852 | |
a71fe8b8 LP |
853 | case SOURCE_POST: |
854 | set_remove(s->event->post_sources, s); | |
855 | break; | |
da7e457c | 856 | |
a71fe8b8 LP |
857 | case SOURCE_EXIT: |
858 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
859 | break; | |
0eb2e0e3 | 860 | |
a71fe8b8 LP |
861 | default: |
862 | assert_not_reached("Wut? I shouldn't exist."); | |
863 | } | |
6e9feda3 | 864 | |
a71fe8b8 LP |
865 | if (s->pending) |
866 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 867 | |
a71fe8b8 LP |
868 | if (s->prepare) |
869 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 870 | |
a71fe8b8 | 871 | event = s->event; |
fd38203a | 872 | |
a71fe8b8 LP |
873 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
874 | s->event = NULL; | |
875 | LIST_REMOVE(sources, event->sources, s); | |
876 | event->n_sources--; | |
fd38203a | 877 | |
a71fe8b8 LP |
878 | if (!s->floating) |
879 | sd_event_unref(event); | |
880 | } | |
881 | ||
882 | static void source_free(sd_event_source *s) { | |
883 | assert(s); | |
fd38203a | 884 | |
a71fe8b8 | 885 | source_disconnect(s); |
356779df | 886 | free(s->description); |
fd38203a LP |
887 | free(s); |
888 | } | |
889 | ||
890 | static int source_set_pending(sd_event_source *s, bool b) { | |
891 | int r; | |
892 | ||
893 | assert(s); | |
6203e07a | 894 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
895 | |
896 | if (s->pending == b) | |
897 | return 0; | |
898 | ||
899 | s->pending = b; | |
900 | ||
901 | if (b) { | |
902 | s->pending_iteration = s->event->iteration; | |
903 | ||
904 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
905 | if (r < 0) { | |
906 | s->pending = false; | |
907 | return r; | |
908 | } | |
909 | } else | |
910 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
911 | ||
6a0f1f6d LP |
912 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
913 | struct clock_data *d; | |
914 | ||
915 | d = event_get_clock_data(s->event, s->type); | |
916 | assert(d); | |
917 | ||
918 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
919 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 920 | d->needs_rearm = true; |
2576a19e LP |
921 | } |
922 | ||
9da4cb2b LP |
923 | if (s->type == SOURCE_SIGNAL && !b) { |
924 | struct signal_data *d; | |
925 | ||
926 | d = hashmap_get(s->event->signal_data, &s->priority); | |
927 | if (d && d->current == s) | |
928 | d->current = NULL; | |
929 | } | |
930 | ||
fd38203a LP |
931 | return 0; |
932 | } | |
933 | ||
a71fe8b8 | 934 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
935 | sd_event_source *s; |
936 | ||
937 | assert(e); | |
938 | ||
939 | s = new0(sd_event_source, 1); | |
940 | if (!s) | |
941 | return NULL; | |
942 | ||
da7e457c | 943 | s->n_ref = 1; |
a71fe8b8 | 944 | s->event = e; |
4a134c49 | 945 | s->floating = floating; |
fd38203a | 946 | s->type = type; |
fd38203a | 947 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
948 | |
949 | if (!floating) | |
950 | sd_event_ref(e); | |
fd38203a | 951 | |
a71fe8b8 | 952 | LIST_PREPEND(sources, e->sources, s); |
313cefa1 | 953 | e->n_sources++; |
15b38f93 | 954 | |
fd38203a LP |
955 | return s; |
956 | } | |
957 | ||
f7262a9f | 958 | _public_ int sd_event_add_io( |
fd38203a | 959 | sd_event *e, |
151b9b96 | 960 | sd_event_source **ret, |
fd38203a LP |
961 | int fd, |
962 | uint32_t events, | |
718db961 | 963 | sd_event_io_handler_t callback, |
151b9b96 | 964 | void *userdata) { |
fd38203a LP |
965 | |
966 | sd_event_source *s; | |
967 | int r; | |
968 | ||
305f78bf | 969 | assert_return(e, -EINVAL); |
8ac43fee | 970 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 971 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 972 | assert_return(callback, -EINVAL); |
da7e457c | 973 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 974 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 975 | |
a71fe8b8 | 976 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
977 | if (!s) |
978 | return -ENOMEM; | |
979 | ||
9da4cb2b | 980 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
981 | s->io.fd = fd; |
982 | s->io.events = events; | |
983 | s->io.callback = callback; | |
984 | s->userdata = userdata; | |
baf76283 | 985 | s->enabled = SD_EVENT_ON; |
fd38203a | 986 | |
baf76283 | 987 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
988 | if (r < 0) { |
989 | source_free(s); | |
050f74f2 | 990 | return r; |
fd38203a LP |
991 | } |
992 | ||
a71fe8b8 LP |
993 | if (ret) |
994 | *ret = s; | |
995 | ||
fd38203a LP |
996 | return 0; |
997 | } | |
998 | ||
52444dc4 LP |
999 | static void initialize_perturb(sd_event *e) { |
1000 | sd_id128_t bootid = {}; | |
1001 | ||
1002 | /* When we sleep for longer, we try to realign the wakeup to | |
1003 | the same time wihtin each minute/second/250ms, so that | |
1004 | events all across the system can be coalesced into a single | |
1005 | CPU wakeup. However, let's take some system-specific | |
1006 | randomness for this value, so that in a network of systems | |
1007 | with synced clocks timer events are distributed a | |
1008 | bit. Here, we calculate a perturbation usec offset from the | |
1009 | boot ID. */ | |
1010 | ||
3a43da28 | 1011 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1012 | return; |
1013 | ||
1014 | if (sd_id128_get_boot(&bootid) >= 0) | |
1015 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1016 | } | |
1017 | ||
fd38203a LP |
1018 | static int event_setup_timer_fd( |
1019 | sd_event *e, | |
6a0f1f6d LP |
1020 | struct clock_data *d, |
1021 | clockid_t clock) { | |
fd38203a LP |
1022 | |
1023 | struct epoll_event ev = {}; | |
1024 | int r, fd; | |
1025 | ||
1026 | assert(e); | |
6a0f1f6d | 1027 | assert(d); |
fd38203a | 1028 | |
6a0f1f6d | 1029 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1030 | return 0; |
1031 | ||
6a0f1f6d | 1032 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1033 | if (fd < 0) |
1034 | return -errno; | |
1035 | ||
1036 | ev.events = EPOLLIN; | |
9da4cb2b | 1037 | ev.data.ptr = d; |
fd38203a LP |
1038 | |
1039 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1040 | if (r < 0) { | |
03e334a1 | 1041 | safe_close(fd); |
fd38203a LP |
1042 | return -errno; |
1043 | } | |
1044 | ||
6a0f1f6d | 1045 | d->fd = fd; |
fd38203a LP |
1046 | return 0; |
1047 | } | |
1048 | ||
c4f1aff2 TG |
1049 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1050 | assert(s); | |
1051 | ||
1052 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1053 | } | |
1054 | ||
6a0f1f6d | 1055 | _public_ int sd_event_add_time( |
fd38203a | 1056 | sd_event *e, |
151b9b96 | 1057 | sd_event_source **ret, |
6a0f1f6d | 1058 | clockid_t clock, |
fd38203a | 1059 | uint64_t usec, |
c2ba3ad6 | 1060 | uint64_t accuracy, |
718db961 | 1061 | sd_event_time_handler_t callback, |
151b9b96 | 1062 | void *userdata) { |
fd38203a | 1063 | |
6a0f1f6d | 1064 | EventSourceType type; |
fd38203a | 1065 | sd_event_source *s; |
6a0f1f6d | 1066 | struct clock_data *d; |
fd38203a LP |
1067 | int r; |
1068 | ||
305f78bf | 1069 | assert_return(e, -EINVAL); |
305f78bf | 1070 | assert_return(accuracy != (uint64_t) -1, -EINVAL); |
da7e457c | 1071 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1072 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1073 | |
e475d10c LP |
1074 | if (!clock_supported(clock)) /* Checks whether the kernel supports the clock */ |
1075 | return -EOPNOTSUPP; | |
1076 | ||
1077 | type = clock_to_event_source_type(clock); /* checks whether sd-event supports this clock */ | |
1078 | if (type < 0) | |
3411372e LP |
1079 | return -EOPNOTSUPP; |
1080 | ||
c4f1aff2 TG |
1081 | if (!callback) |
1082 | callback = time_exit_callback; | |
1083 | ||
6a0f1f6d LP |
1084 | d = event_get_clock_data(e, type); |
1085 | assert(d); | |
c2ba3ad6 | 1086 | |
c983e776 EV |
1087 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1088 | if (r < 0) | |
1089 | return r; | |
fd38203a | 1090 | |
c983e776 EV |
1091 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1092 | if (r < 0) | |
1093 | return r; | |
fd38203a | 1094 | |
6a0f1f6d LP |
1095 | if (d->fd < 0) { |
1096 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1097 | if (r < 0) |
1098 | return r; | |
1099 | } | |
1100 | ||
a71fe8b8 | 1101 | s = source_new(e, !ret, type); |
fd38203a LP |
1102 | if (!s) |
1103 | return -ENOMEM; | |
1104 | ||
1105 | s->time.next = usec; | |
c2ba3ad6 | 1106 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1107 | s->time.callback = callback; |
da7e457c | 1108 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1109 | s->userdata = userdata; |
baf76283 | 1110 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1111 | |
e07bbb7c TG |
1112 | d->needs_rearm = true; |
1113 | ||
6a0f1f6d | 1114 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1115 | if (r < 0) |
1116 | goto fail; | |
1117 | ||
6a0f1f6d | 1118 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1119 | if (r < 0) |
1120 | goto fail; | |
fd38203a | 1121 | |
a71fe8b8 LP |
1122 | if (ret) |
1123 | *ret = s; | |
1124 | ||
fd38203a | 1125 | return 0; |
c2ba3ad6 LP |
1126 | |
1127 | fail: | |
1128 | source_free(s); | |
1129 | return r; | |
fd38203a LP |
1130 | } |
1131 | ||
59bc1fd7 LP |
1132 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1133 | assert(s); | |
1134 | ||
1135 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1136 | } | |
1137 | ||
f7262a9f | 1138 | _public_ int sd_event_add_signal( |
305f78bf | 1139 | sd_event *e, |
151b9b96 | 1140 | sd_event_source **ret, |
305f78bf | 1141 | int sig, |
718db961 | 1142 | sd_event_signal_handler_t callback, |
151b9b96 | 1143 | void *userdata) { |
305f78bf | 1144 | |
fd38203a | 1145 | sd_event_source *s; |
9da4cb2b | 1146 | struct signal_data *d; |
3022d74b | 1147 | sigset_t ss; |
fd38203a LP |
1148 | int r; |
1149 | ||
305f78bf | 1150 | assert_return(e, -EINVAL); |
6eb7c172 | 1151 | assert_return(SIGNAL_VALID(sig), -EINVAL); |
da7e457c | 1152 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1153 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1154 | |
59bc1fd7 LP |
1155 | if (!callback) |
1156 | callback = signal_exit_callback; | |
1157 | ||
3022d74b | 1158 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1159 | if (r != 0) |
1160 | return -r; | |
3022d74b LP |
1161 | |
1162 | if (!sigismember(&ss, sig)) | |
1163 | return -EBUSY; | |
1164 | ||
fd38203a LP |
1165 | if (!e->signal_sources) { |
1166 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1167 | if (!e->signal_sources) | |
1168 | return -ENOMEM; | |
1169 | } else if (e->signal_sources[sig]) | |
1170 | return -EBUSY; | |
1171 | ||
a71fe8b8 | 1172 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1173 | if (!s) |
1174 | return -ENOMEM; | |
1175 | ||
1176 | s->signal.sig = sig; | |
1177 | s->signal.callback = callback; | |
1178 | s->userdata = userdata; | |
baf76283 | 1179 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1180 | |
1181 | e->signal_sources[sig] = s; | |
fd38203a | 1182 | |
9da4cb2b LP |
1183 | r = event_make_signal_data(e, sig, &d); |
1184 | if (r < 0) { | |
1185 | source_free(s); | |
1186 | return r; | |
fd38203a LP |
1187 | } |
1188 | ||
f1f00dbb LP |
1189 | /* Use the signal name as description for the event source by default */ |
1190 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1191 | ||
a71fe8b8 LP |
1192 | if (ret) |
1193 | *ret = s; | |
1194 | ||
fd38203a LP |
1195 | return 0; |
1196 | } | |
1197 | ||
f7262a9f | 1198 | _public_ int sd_event_add_child( |
305f78bf | 1199 | sd_event *e, |
151b9b96 | 1200 | sd_event_source **ret, |
305f78bf LP |
1201 | pid_t pid, |
1202 | int options, | |
718db961 | 1203 | sd_event_child_handler_t callback, |
151b9b96 | 1204 | void *userdata) { |
305f78bf | 1205 | |
fd38203a LP |
1206 | sd_event_source *s; |
1207 | int r; | |
1208 | ||
305f78bf LP |
1209 | assert_return(e, -EINVAL); |
1210 | assert_return(pid > 1, -EINVAL); | |
1211 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1212 | assert_return(options != 0, -EINVAL); | |
1213 | assert_return(callback, -EINVAL); | |
da7e457c | 1214 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1215 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1216 | |
d5099efc | 1217 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1218 | if (r < 0) |
1219 | return r; | |
1220 | ||
4a0b58c4 | 1221 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1222 | return -EBUSY; |
1223 | ||
a71fe8b8 | 1224 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1225 | if (!s) |
1226 | return -ENOMEM; | |
1227 | ||
1228 | s->child.pid = pid; | |
1229 | s->child.options = options; | |
1230 | s->child.callback = callback; | |
1231 | s->userdata = userdata; | |
baf76283 | 1232 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1233 | |
4a0b58c4 | 1234 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
fd38203a LP |
1235 | if (r < 0) { |
1236 | source_free(s); | |
1237 | return r; | |
1238 | } | |
1239 | ||
313cefa1 | 1240 | e->n_enabled_child_sources++; |
fd38203a | 1241 | |
9da4cb2b LP |
1242 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1243 | if (r < 0) { | |
1244 | e->n_enabled_child_sources--; | |
1245 | source_free(s); | |
1246 | return r; | |
fd38203a LP |
1247 | } |
1248 | ||
c2ba3ad6 LP |
1249 | e->need_process_child = true; |
1250 | ||
a71fe8b8 LP |
1251 | if (ret) |
1252 | *ret = s; | |
1253 | ||
fd38203a LP |
1254 | return 0; |
1255 | } | |
1256 | ||
f7262a9f | 1257 | _public_ int sd_event_add_defer( |
305f78bf | 1258 | sd_event *e, |
151b9b96 | 1259 | sd_event_source **ret, |
718db961 | 1260 | sd_event_handler_t callback, |
151b9b96 | 1261 | void *userdata) { |
305f78bf | 1262 | |
fd38203a LP |
1263 | sd_event_source *s; |
1264 | int r; | |
1265 | ||
305f78bf LP |
1266 | assert_return(e, -EINVAL); |
1267 | assert_return(callback, -EINVAL); | |
da7e457c | 1268 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1269 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1270 | |
a71fe8b8 | 1271 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1272 | if (!s) |
1273 | return -ENOMEM; | |
1274 | ||
1275 | s->defer.callback = callback; | |
1276 | s->userdata = userdata; | |
baf76283 | 1277 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1278 | |
1279 | r = source_set_pending(s, true); | |
1280 | if (r < 0) { | |
1281 | source_free(s); | |
1282 | return r; | |
1283 | } | |
1284 | ||
a71fe8b8 LP |
1285 | if (ret) |
1286 | *ret = s; | |
1287 | ||
fd38203a LP |
1288 | return 0; |
1289 | } | |
1290 | ||
6e9feda3 LP |
1291 | _public_ int sd_event_add_post( |
1292 | sd_event *e, | |
1293 | sd_event_source **ret, | |
1294 | sd_event_handler_t callback, | |
1295 | void *userdata) { | |
1296 | ||
1297 | sd_event_source *s; | |
1298 | int r; | |
1299 | ||
1300 | assert_return(e, -EINVAL); | |
1301 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1302 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1303 | assert_return(!event_pid_changed(e), -ECHILD); | |
1304 | ||
d5099efc | 1305 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1306 | if (r < 0) |
1307 | return r; | |
1308 | ||
a71fe8b8 | 1309 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1310 | if (!s) |
1311 | return -ENOMEM; | |
1312 | ||
1313 | s->post.callback = callback; | |
1314 | s->userdata = userdata; | |
1315 | s->enabled = SD_EVENT_ON; | |
1316 | ||
1317 | r = set_put(e->post_sources, s); | |
1318 | if (r < 0) { | |
1319 | source_free(s); | |
1320 | return r; | |
1321 | } | |
1322 | ||
a71fe8b8 LP |
1323 | if (ret) |
1324 | *ret = s; | |
1325 | ||
6e9feda3 LP |
1326 | return 0; |
1327 | } | |
1328 | ||
6203e07a | 1329 | _public_ int sd_event_add_exit( |
305f78bf | 1330 | sd_event *e, |
151b9b96 | 1331 | sd_event_source **ret, |
718db961 | 1332 | sd_event_handler_t callback, |
151b9b96 | 1333 | void *userdata) { |
305f78bf | 1334 | |
da7e457c LP |
1335 | sd_event_source *s; |
1336 | int r; | |
1337 | ||
1338 | assert_return(e, -EINVAL); | |
1339 | assert_return(callback, -EINVAL); | |
1340 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1341 | assert_return(!event_pid_changed(e), -ECHILD); | |
1342 | ||
c983e776 EV |
1343 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1344 | if (r < 0) | |
1345 | return r; | |
da7e457c | 1346 | |
a71fe8b8 | 1347 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1348 | if (!s) |
da7e457c | 1349 | return -ENOMEM; |
fd38203a | 1350 | |
6203e07a | 1351 | s->exit.callback = callback; |
da7e457c | 1352 | s->userdata = userdata; |
6203e07a | 1353 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1354 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1355 | |
6203e07a | 1356 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1357 | if (r < 0) { |
1358 | source_free(s); | |
1359 | return r; | |
1360 | } | |
1361 | ||
a71fe8b8 LP |
1362 | if (ret) |
1363 | *ret = s; | |
1364 | ||
da7e457c LP |
1365 | return 0; |
1366 | } | |
1367 | ||
f7262a9f | 1368 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
6680dd6b LP |
1369 | |
1370 | if (!s) | |
1371 | return NULL; | |
da7e457c LP |
1372 | |
1373 | assert(s->n_ref >= 1); | |
1374 | s->n_ref++; | |
fd38203a LP |
1375 | |
1376 | return s; | |
1377 | } | |
1378 | ||
f7262a9f | 1379 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1380 | |
1381 | if (!s) | |
1382 | return NULL; | |
fd38203a | 1383 | |
da7e457c LP |
1384 | assert(s->n_ref >= 1); |
1385 | s->n_ref--; | |
1386 | ||
12179984 LP |
1387 | if (s->n_ref <= 0) { |
1388 | /* Here's a special hack: when we are called from a | |
1389 | * dispatch handler we won't free the event source | |
1390 | * immediately, but we will detach the fd from the | |
1391 | * epoll. This way it is safe for the caller to unref | |
1392 | * the event source and immediately close the fd, but | |
1393 | * we still retain a valid event source object after | |
1394 | * the callback. */ | |
1395 | ||
1396 | if (s->dispatching) { | |
1397 | if (s->type == SOURCE_IO) | |
1398 | source_io_unregister(s); | |
a71fe8b8 LP |
1399 | |
1400 | source_disconnect(s); | |
12179984 LP |
1401 | } else |
1402 | source_free(s); | |
1403 | } | |
fd38203a LP |
1404 | |
1405 | return NULL; | |
1406 | } | |
1407 | ||
356779df | 1408 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1409 | assert_return(s, -EINVAL); |
f4b2933e | 1410 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1411 | |
356779df | 1412 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1413 | } |
1414 | ||
356779df | 1415 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1416 | assert_return(s, -EINVAL); |
356779df | 1417 | assert_return(description, -EINVAL); |
f4b2933e LP |
1418 | assert_return(s->description, -ENXIO); |
1419 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1420 | |
356779df | 1421 | *description = s->description; |
f7f53e9e TG |
1422 | return 0; |
1423 | } | |
1424 | ||
adcc4ca3 | 1425 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1426 | assert_return(s, NULL); |
eaa3cbef LP |
1427 | |
1428 | return s->event; | |
1429 | } | |
1430 | ||
f7262a9f | 1431 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1432 | assert_return(s, -EINVAL); |
6203e07a | 1433 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1434 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1435 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1436 | |
1437 | return s->pending; | |
1438 | } | |
1439 | ||
f7262a9f | 1440 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1441 | assert_return(s, -EINVAL); |
1442 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1443 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1444 | |
1445 | return s->io.fd; | |
1446 | } | |
1447 | ||
30caf8f3 LP |
1448 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1449 | int r; | |
1450 | ||
1451 | assert_return(s, -EINVAL); | |
8ac43fee | 1452 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1453 | assert_return(s->type == SOURCE_IO, -EDOM); |
1454 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1455 | ||
1456 | if (s->io.fd == fd) | |
1457 | return 0; | |
1458 | ||
1459 | if (s->enabled == SD_EVENT_OFF) { | |
1460 | s->io.fd = fd; | |
1461 | s->io.registered = false; | |
1462 | } else { | |
1463 | int saved_fd; | |
1464 | ||
1465 | saved_fd = s->io.fd; | |
1466 | assert(s->io.registered); | |
1467 | ||
1468 | s->io.fd = fd; | |
1469 | s->io.registered = false; | |
1470 | ||
1471 | r = source_io_register(s, s->enabled, s->io.events); | |
1472 | if (r < 0) { | |
1473 | s->io.fd = saved_fd; | |
1474 | s->io.registered = true; | |
1475 | return r; | |
1476 | } | |
1477 | ||
1478 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1479 | } | |
1480 | ||
1481 | return 0; | |
1482 | } | |
1483 | ||
f7262a9f | 1484 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1485 | assert_return(s, -EINVAL); |
1486 | assert_return(events, -EINVAL); | |
1487 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1488 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1489 | |
1490 | *events = s->io.events; | |
1491 | return 0; | |
1492 | } | |
1493 | ||
f7262a9f | 1494 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1495 | int r; |
1496 | ||
305f78bf LP |
1497 | assert_return(s, -EINVAL); |
1498 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1499 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1500 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1501 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1502 | |
b63c8d4f DH |
1503 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1504 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1505 | return 0; |
1506 | ||
baf76283 | 1507 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1508 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1509 | if (r < 0) |
1510 | return r; | |
1511 | } | |
1512 | ||
1513 | s->io.events = events; | |
503f39c3 | 1514 | source_set_pending(s, false); |
fd38203a LP |
1515 | |
1516 | return 0; | |
1517 | } | |
1518 | ||
f7262a9f | 1519 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1520 | assert_return(s, -EINVAL); |
1521 | assert_return(revents, -EINVAL); | |
1522 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1523 | assert_return(s->pending, -ENODATA); | |
1524 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1525 | |
1526 | *revents = s->io.revents; | |
1527 | return 0; | |
1528 | } | |
1529 | ||
f7262a9f | 1530 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1531 | assert_return(s, -EINVAL); |
1532 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1533 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1534 | |
1535 | return s->signal.sig; | |
1536 | } | |
1537 | ||
31927c16 | 1538 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1539 | assert_return(s, -EINVAL); |
1540 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1541 | |
6680b8d1 ME |
1542 | *priority = s->priority; |
1543 | return 0; | |
fd38203a LP |
1544 | } |
1545 | ||
31927c16 | 1546 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1547 | int r; |
1548 | ||
305f78bf | 1549 | assert_return(s, -EINVAL); |
da7e457c | 1550 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1551 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1552 | |
1553 | if (s->priority == priority) | |
1554 | return 0; | |
1555 | ||
9da4cb2b LP |
1556 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1557 | struct signal_data *old, *d; | |
1558 | ||
1559 | /* Move us from the signalfd belonging to the old | |
1560 | * priority to the signalfd of the new priority */ | |
1561 | ||
1562 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1563 | ||
1564 | s->priority = priority; | |
1565 | ||
1566 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1567 | if (r < 0) { | |
1568 | s->priority = old->priority; | |
1569 | return r; | |
1570 | } | |
1571 | ||
1572 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1573 | } else | |
1574 | s->priority = priority; | |
fd38203a LP |
1575 | |
1576 | if (s->pending) | |
c2ba3ad6 | 1577 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1578 | |
1579 | if (s->prepare) | |
c2ba3ad6 | 1580 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1581 | |
6203e07a LP |
1582 | if (s->type == SOURCE_EXIT) |
1583 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1584 | |
fd38203a LP |
1585 | return 0; |
1586 | } | |
1587 | ||
f7262a9f | 1588 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1589 | assert_return(s, -EINVAL); |
1590 | assert_return(m, -EINVAL); | |
1591 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1592 | |
baf76283 | 1593 | *m = s->enabled; |
fd38203a LP |
1594 | return 0; |
1595 | } | |
1596 | ||
f7262a9f | 1597 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1598 | int r; |
1599 | ||
305f78bf | 1600 | assert_return(s, -EINVAL); |
945c2931 | 1601 | assert_return(IN_SET(m, SD_EVENT_OFF, SD_EVENT_ON, SD_EVENT_ONESHOT), -EINVAL); |
305f78bf | 1602 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1603 | |
cc567911 LP |
1604 | /* If we are dead anyway, we are fine with turning off |
1605 | * sources, but everything else needs to fail. */ | |
1606 | if (s->event->state == SD_EVENT_FINISHED) | |
1607 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1608 | ||
baf76283 | 1609 | if (s->enabled == m) |
fd38203a LP |
1610 | return 0; |
1611 | ||
baf76283 | 1612 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1613 | |
1614 | switch (s->type) { | |
1615 | ||
1616 | case SOURCE_IO: | |
366e6411 | 1617 | source_io_unregister(s); |
baf76283 | 1618 | s->enabled = m; |
fd38203a LP |
1619 | break; |
1620 | ||
6a0f1f6d | 1621 | case SOURCE_TIME_REALTIME: |
a8548816 | 1622 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1623 | case SOURCE_TIME_MONOTONIC: |
1624 | case SOURCE_TIME_REALTIME_ALARM: | |
1625 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1626 | struct clock_data *d; | |
fd38203a | 1627 | |
baf76283 | 1628 | s->enabled = m; |
6a0f1f6d LP |
1629 | d = event_get_clock_data(s->event, s->type); |
1630 | assert(d); | |
1631 | ||
1632 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1633 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1634 | d->needs_rearm = true; |
fd38203a | 1635 | break; |
6a0f1f6d | 1636 | } |
fd38203a LP |
1637 | |
1638 | case SOURCE_SIGNAL: | |
baf76283 | 1639 | s->enabled = m; |
4807d2d0 | 1640 | |
9da4cb2b | 1641 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1642 | break; |
1643 | ||
1644 | case SOURCE_CHILD: | |
baf76283 | 1645 | s->enabled = m; |
fd38203a | 1646 | |
baf76283 LP |
1647 | assert(s->event->n_enabled_child_sources > 0); |
1648 | s->event->n_enabled_child_sources--; | |
fd38203a | 1649 | |
9da4cb2b | 1650 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1651 | break; |
1652 | ||
6203e07a | 1653 | case SOURCE_EXIT: |
305f78bf | 1654 | s->enabled = m; |
6203e07a | 1655 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1656 | break; |
1657 | ||
1658 | case SOURCE_DEFER: | |
6e9feda3 | 1659 | case SOURCE_POST: |
baf76283 | 1660 | s->enabled = m; |
fd38203a | 1661 | break; |
9d3e3aa5 | 1662 | |
6a0f1f6d | 1663 | default: |
9d3e3aa5 | 1664 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1665 | } |
1666 | ||
1667 | } else { | |
1668 | switch (s->type) { | |
1669 | ||
1670 | case SOURCE_IO: | |
1671 | r = source_io_register(s, m, s->io.events); | |
1672 | if (r < 0) | |
1673 | return r; | |
1674 | ||
baf76283 | 1675 | s->enabled = m; |
fd38203a LP |
1676 | break; |
1677 | ||
6a0f1f6d | 1678 | case SOURCE_TIME_REALTIME: |
a8548816 | 1679 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1680 | case SOURCE_TIME_MONOTONIC: |
1681 | case SOURCE_TIME_REALTIME_ALARM: | |
1682 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1683 | struct clock_data *d; | |
fd38203a | 1684 | |
baf76283 | 1685 | s->enabled = m; |
6a0f1f6d LP |
1686 | d = event_get_clock_data(s->event, s->type); |
1687 | assert(d); | |
1688 | ||
1689 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1690 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1691 | d->needs_rearm = true; |
fd38203a | 1692 | break; |
6a0f1f6d | 1693 | } |
fd38203a LP |
1694 | |
1695 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1696 | |
1697 | s->enabled = m; | |
9da4cb2b LP |
1698 | |
1699 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1700 | if (r < 0) { | |
1701 | s->enabled = SD_EVENT_OFF; | |
1702 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1703 | return r; | |
1704 | } | |
1705 | ||
fd38203a LP |
1706 | break; |
1707 | ||
1708 | case SOURCE_CHILD: | |
4807d2d0 | 1709 | |
9da4cb2b | 1710 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1711 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1712 | |
1713 | s->enabled = m; | |
9da4cb2b | 1714 | |
10edebf6 | 1715 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
1716 | if (r < 0) { |
1717 | s->enabled = SD_EVENT_OFF; | |
1718 | s->event->n_enabled_child_sources--; | |
1719 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1720 | return r; | |
1721 | } | |
1722 | ||
fd38203a LP |
1723 | break; |
1724 | ||
6203e07a | 1725 | case SOURCE_EXIT: |
305f78bf | 1726 | s->enabled = m; |
6203e07a | 1727 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1728 | break; |
1729 | ||
1730 | case SOURCE_DEFER: | |
6e9feda3 | 1731 | case SOURCE_POST: |
baf76283 | 1732 | s->enabled = m; |
fd38203a | 1733 | break; |
9d3e3aa5 | 1734 | |
6a0f1f6d | 1735 | default: |
9d3e3aa5 | 1736 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1737 | } |
1738 | } | |
1739 | ||
1740 | if (s->pending) | |
1741 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1742 | ||
1743 | if (s->prepare) | |
1744 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1745 | ||
1746 | return 0; | |
1747 | } | |
1748 | ||
f7262a9f | 1749 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1750 | assert_return(s, -EINVAL); |
1751 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1752 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1753 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1754 | |
1755 | *usec = s->time.next; | |
1756 | return 0; | |
1757 | } | |
1758 | ||
f7262a9f | 1759 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1760 | struct clock_data *d; |
1761 | ||
305f78bf | 1762 | assert_return(s, -EINVAL); |
6a0f1f6d | 1763 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1764 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1765 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1766 | |
fd38203a | 1767 | s->time.next = usec; |
2576a19e | 1768 | |
0cc1125a | 1769 | source_set_pending(s, false); |
fd38203a | 1770 | |
6a0f1f6d LP |
1771 | d = event_get_clock_data(s->event, s->type); |
1772 | assert(d); | |
1773 | ||
1774 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1775 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1776 | d->needs_rearm = true; |
fd38203a LP |
1777 | |
1778 | return 0; | |
1779 | } | |
1780 | ||
f7262a9f | 1781 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1782 | assert_return(s, -EINVAL); |
1783 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1784 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1785 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1786 | ||
1787 | *usec = s->time.accuracy; | |
1788 | return 0; | |
1789 | } | |
1790 | ||
f7262a9f | 1791 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1792 | struct clock_data *d; |
1793 | ||
305f78bf LP |
1794 | assert_return(s, -EINVAL); |
1795 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1796 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1797 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1798 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1799 | |
1800 | if (usec == 0) | |
1801 | usec = DEFAULT_ACCURACY_USEC; | |
1802 | ||
eaa3cbef LP |
1803 | s->time.accuracy = usec; |
1804 | ||
2576a19e LP |
1805 | source_set_pending(s, false); |
1806 | ||
6a0f1f6d LP |
1807 | d = event_get_clock_data(s->event, s->type); |
1808 | assert(d); | |
1809 | ||
1810 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1811 | d->needs_rearm = true; |
6a0f1f6d LP |
1812 | |
1813 | return 0; | |
1814 | } | |
1815 | ||
1816 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1817 | assert_return(s, -EINVAL); | |
1818 | assert_return(clock, -EINVAL); | |
1819 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1820 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1821 | |
6a0f1f6d | 1822 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1823 | return 0; |
1824 | } | |
1825 | ||
f7262a9f | 1826 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1827 | assert_return(s, -EINVAL); |
1828 | assert_return(pid, -EINVAL); | |
1829 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1830 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1831 | ||
1832 | *pid = s->child.pid; | |
1833 | return 0; | |
1834 | } | |
1835 | ||
718db961 | 1836 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1837 | int r; |
1838 | ||
da7e457c | 1839 | assert_return(s, -EINVAL); |
6203e07a | 1840 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1841 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1842 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1843 | |
1844 | if (s->prepare == callback) | |
1845 | return 0; | |
1846 | ||
1847 | if (callback && s->prepare) { | |
1848 | s->prepare = callback; | |
1849 | return 0; | |
1850 | } | |
1851 | ||
1852 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1853 | if (r < 0) | |
1854 | return r; | |
1855 | ||
1856 | s->prepare = callback; | |
1857 | ||
1858 | if (callback) { | |
1859 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1860 | if (r < 0) | |
1861 | return r; | |
1862 | } else | |
1863 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1864 | ||
1865 | return 0; | |
1866 | } | |
1867 | ||
f7262a9f | 1868 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1869 | assert_return(s, NULL); |
fd38203a LP |
1870 | |
1871 | return s->userdata; | |
1872 | } | |
1873 | ||
8f726607 LP |
1874 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1875 | void *ret; | |
1876 | ||
1877 | assert_return(s, NULL); | |
1878 | ||
1879 | ret = s->userdata; | |
1880 | s->userdata = userdata; | |
1881 | ||
1882 | return ret; | |
1883 | } | |
1884 | ||
c2ba3ad6 LP |
1885 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1886 | usec_t c; | |
1887 | assert(e); | |
1888 | assert(a <= b); | |
1889 | ||
1890 | if (a <= 0) | |
1891 | return 0; | |
393003e1 LP |
1892 | if (a >= USEC_INFINITY) |
1893 | return USEC_INFINITY; | |
c2ba3ad6 LP |
1894 | |
1895 | if (b <= a + 1) | |
1896 | return a; | |
1897 | ||
52444dc4 LP |
1898 | initialize_perturb(e); |
1899 | ||
c2ba3ad6 LP |
1900 | /* |
1901 | Find a good time to wake up again between times a and b. We | |
1902 | have two goals here: | |
1903 | ||
1904 | a) We want to wake up as seldom as possible, hence prefer | |
1905 | later times over earlier times. | |
1906 | ||
1907 | b) But if we have to wake up, then let's make sure to | |
1908 | dispatch as much as possible on the entire system. | |
1909 | ||
1910 | We implement this by waking up everywhere at the same time | |
850516e0 | 1911 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1912 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1913 | then we try to find the same spot in every 10s, then 1s and |
1914 | then 250ms step. Otherwise, we pick the last possible time | |
1915 | to wake up. | |
c2ba3ad6 LP |
1916 | */ |
1917 | ||
850516e0 LP |
1918 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1919 | if (c >= b) { | |
1920 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1921 | return b; | |
1922 | ||
1923 | c -= USEC_PER_MINUTE; | |
1924 | } | |
1925 | ||
ba276c81 LP |
1926 | if (c >= a) |
1927 | return c; | |
1928 | ||
1929 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1930 | if (c >= b) { | |
1931 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1932 | return b; | |
1933 | ||
1934 | c -= USEC_PER_SEC*10; | |
1935 | } | |
1936 | ||
850516e0 LP |
1937 | if (c >= a) |
1938 | return c; | |
1939 | ||
1940 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1941 | if (c >= b) { |
1942 | if (_unlikely_(c < USEC_PER_SEC)) | |
1943 | return b; | |
1944 | ||
1945 | c -= USEC_PER_SEC; | |
1946 | } | |
1947 | ||
1948 | if (c >= a) | |
1949 | return c; | |
1950 | ||
1951 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1952 | if (c >= b) { | |
1953 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1954 | return b; | |
1955 | ||
1956 | c -= USEC_PER_MSEC*250; | |
1957 | } | |
1958 | ||
1959 | if (c >= a) | |
1960 | return c; | |
1961 | ||
1962 | return b; | |
1963 | } | |
1964 | ||
fd38203a LP |
1965 | static int event_arm_timer( |
1966 | sd_event *e, | |
6a0f1f6d | 1967 | struct clock_data *d) { |
fd38203a LP |
1968 | |
1969 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1970 | sd_event_source *a, *b; |
1971 | usec_t t; | |
fd38203a LP |
1972 | int r; |
1973 | ||
cde93897 | 1974 | assert(e); |
6a0f1f6d | 1975 | assert(d); |
fd38203a | 1976 | |
d06441da | 1977 | if (!d->needs_rearm) |
212bbb17 TG |
1978 | return 0; |
1979 | else | |
1980 | d->needs_rearm = false; | |
1981 | ||
6a0f1f6d | 1982 | a = prioq_peek(d->earliest); |
393003e1 | 1983 | if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) { |
72aedc1e | 1984 | |
6a0f1f6d | 1985 | if (d->fd < 0) |
c57b5ca3 LP |
1986 | return 0; |
1987 | ||
3a43da28 | 1988 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1989 | return 0; |
1990 | ||
1991 | /* disarm */ | |
6a0f1f6d | 1992 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1993 | if (r < 0) |
1994 | return r; | |
1995 | ||
3a43da28 | 1996 | d->next = USEC_INFINITY; |
fd38203a | 1997 | return 0; |
72aedc1e | 1998 | } |
fd38203a | 1999 | |
6a0f1f6d | 2000 | b = prioq_peek(d->latest); |
baf76283 | 2001 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 | 2002 | |
1bce0ffa | 2003 | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
6a0f1f6d | 2004 | if (d->next == t) |
fd38203a LP |
2005 | return 0; |
2006 | ||
6a0f1f6d | 2007 | assert_se(d->fd >= 0); |
fd38203a | 2008 | |
c2ba3ad6 | 2009 | if (t == 0) { |
fd38203a LP |
2010 | /* We don' want to disarm here, just mean some time looooong ago. */ |
2011 | its.it_value.tv_sec = 0; | |
2012 | its.it_value.tv_nsec = 1; | |
2013 | } else | |
c2ba3ad6 | 2014 | timespec_store(&its.it_value, t); |
fd38203a | 2015 | |
6a0f1f6d | 2016 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 2017 | if (r < 0) |
cde93897 | 2018 | return -errno; |
fd38203a | 2019 | |
6a0f1f6d | 2020 | d->next = t; |
fd38203a LP |
2021 | return 0; |
2022 | } | |
2023 | ||
9a800b56 | 2024 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2025 | assert(e); |
2026 | assert(s); | |
2027 | assert(s->type == SOURCE_IO); | |
2028 | ||
9a800b56 LP |
2029 | /* If the event source was already pending, we just OR in the |
2030 | * new revents, otherwise we reset the value. The ORing is | |
2031 | * necessary to handle EPOLLONESHOT events properly where | |
2032 | * readability might happen independently of writability, and | |
2033 | * we need to keep track of both */ | |
2034 | ||
2035 | if (s->pending) | |
2036 | s->io.revents |= revents; | |
2037 | else | |
2038 | s->io.revents = revents; | |
fd38203a | 2039 | |
fd38203a LP |
2040 | return source_set_pending(s, true); |
2041 | } | |
2042 | ||
72aedc1e | 2043 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2044 | uint64_t x; |
2045 | ssize_t ss; | |
2046 | ||
2047 | assert(e); | |
da7e457c | 2048 | assert(fd >= 0); |
72aedc1e | 2049 | |
305f78bf | 2050 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2051 | |
2052 | ss = read(fd, &x, sizeof(x)); | |
2053 | if (ss < 0) { | |
945c2931 | 2054 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2055 | return 0; |
2056 | ||
2057 | return -errno; | |
2058 | } | |
2059 | ||
8d35dae7 | 2060 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2061 | return -EIO; |
2062 | ||
cde93897 | 2063 | if (next) |
3a43da28 | 2064 | *next = USEC_INFINITY; |
72aedc1e | 2065 | |
fd38203a LP |
2066 | return 0; |
2067 | } | |
2068 | ||
305f78bf LP |
2069 | static int process_timer( |
2070 | sd_event *e, | |
2071 | usec_t n, | |
6a0f1f6d | 2072 | struct clock_data *d) { |
305f78bf | 2073 | |
fd38203a LP |
2074 | sd_event_source *s; |
2075 | int r; | |
2076 | ||
2077 | assert(e); | |
6a0f1f6d | 2078 | assert(d); |
fd38203a LP |
2079 | |
2080 | for (;;) { | |
6a0f1f6d | 2081 | s = prioq_peek(d->earliest); |
fd38203a LP |
2082 | if (!s || |
2083 | s->time.next > n || | |
baf76283 | 2084 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2085 | s->pending) |
2086 | break; | |
2087 | ||
2088 | r = source_set_pending(s, true); | |
2089 | if (r < 0) | |
2090 | return r; | |
2091 | ||
6a0f1f6d LP |
2092 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2093 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2094 | d->needs_rearm = true; |
fd38203a LP |
2095 | } |
2096 | ||
2097 | return 0; | |
2098 | } | |
2099 | ||
2100 | static int process_child(sd_event *e) { | |
2101 | sd_event_source *s; | |
2102 | Iterator i; | |
2103 | int r; | |
2104 | ||
2105 | assert(e); | |
2106 | ||
c2ba3ad6 LP |
2107 | e->need_process_child = false; |
2108 | ||
fd38203a LP |
2109 | /* |
2110 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2111 | + WNOHANG for each PID we wait for, instead of using | |
2112 | P_ALL. This is because we only want to get child | |
2113 | information of very specific child processes, and not all | |
2114 | of them. We might not have processed the SIGCHLD even of a | |
2115 | previous invocation and we don't want to maintain a | |
2116 | unbounded *per-child* event queue, hence we really don't | |
2117 | want anything flushed out of the kernel's queue that we | |
2118 | don't care about. Since this is O(n) this means that if you | |
2119 | have a lot of processes you probably want to handle SIGCHLD | |
2120 | yourself. | |
08cd1552 LP |
2121 | |
2122 | We do not reap the children here (by using WNOWAIT), this | |
2123 | is only done after the event source is dispatched so that | |
2124 | the callback still sees the process as a zombie. | |
fd38203a LP |
2125 | */ |
2126 | ||
2127 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2128 | assert(s->type == SOURCE_CHILD); | |
2129 | ||
2130 | if (s->pending) | |
2131 | continue; | |
2132 | ||
baf76283 | 2133 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2134 | continue; |
2135 | ||
2136 | zero(s->child.siginfo); | |
08cd1552 LP |
2137 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2138 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2139 | if (r < 0) |
2140 | return -errno; | |
2141 | ||
2142 | if (s->child.siginfo.si_pid != 0) { | |
945c2931 | 2143 | bool zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 LP |
2144 | |
2145 | if (!zombie && (s->child.options & WEXITED)) { | |
2146 | /* If the child isn't dead then let's | |
2147 | * immediately remove the state change | |
2148 | * from the queue, since there's no | |
2149 | * benefit in leaving it queued */ | |
2150 | ||
2151 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2152 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2153 | } | |
2154 | ||
fd38203a LP |
2155 | r = source_set_pending(s, true); |
2156 | if (r < 0) | |
2157 | return r; | |
2158 | } | |
2159 | } | |
2160 | ||
fd38203a LP |
2161 | return 0; |
2162 | } | |
2163 | ||
9da4cb2b | 2164 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2165 | bool read_one = false; |
fd38203a LP |
2166 | int r; |
2167 | ||
da7e457c | 2168 | assert(e); |
305f78bf | 2169 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2170 | |
9da4cb2b LP |
2171 | /* If there's a signal queued on this priority and SIGCHLD is |
2172 | on this priority too, then make sure to recheck the | |
2173 | children we watch. This is because we only ever dequeue | |
2174 | the first signal per priority, and if we dequeue one, and | |
2175 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2176 | might have higher priority children we care about hence we | |
2177 | need to check that explicitly. */ | |
2178 | ||
2179 | if (sigismember(&d->sigset, SIGCHLD)) | |
2180 | e->need_process_child = true; | |
2181 | ||
2182 | /* If there's already an event source pending for this | |
2183 | * priority we don't read another */ | |
2184 | if (d->current) | |
2185 | return 0; | |
2186 | ||
fd38203a | 2187 | for (;;) { |
0eb2e0e3 | 2188 | struct signalfd_siginfo si; |
7057bd99 | 2189 | ssize_t n; |
92daebc0 | 2190 | sd_event_source *s = NULL; |
fd38203a | 2191 | |
9da4cb2b | 2192 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2193 | if (n < 0) { |
945c2931 | 2194 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2195 | return read_one; |
2196 | ||
2197 | return -errno; | |
2198 | } | |
2199 | ||
7057bd99 | 2200 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2201 | return -EIO; |
2202 | ||
6eb7c172 | 2203 | assert(SIGNAL_VALID(si.ssi_signo)); |
7057bd99 | 2204 | |
fd38203a LP |
2205 | read_one = true; |
2206 | ||
92daebc0 LP |
2207 | if (e->signal_sources) |
2208 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2209 | if (!s) |
2210 | continue; | |
9da4cb2b LP |
2211 | if (s->pending) |
2212 | continue; | |
fd38203a LP |
2213 | |
2214 | s->signal.siginfo = si; | |
9da4cb2b LP |
2215 | d->current = s; |
2216 | ||
fd38203a LP |
2217 | r = source_set_pending(s, true); |
2218 | if (r < 0) | |
2219 | return r; | |
9da4cb2b LP |
2220 | |
2221 | return 1; | |
fd38203a | 2222 | } |
fd38203a LP |
2223 | } |
2224 | ||
2225 | static int source_dispatch(sd_event_source *s) { | |
8f5c235d | 2226 | EventSourceType saved_type; |
fe8245eb | 2227 | int r = 0; |
fd38203a LP |
2228 | |
2229 | assert(s); | |
6203e07a | 2230 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2231 | |
8f5c235d LP |
2232 | /* Save the event source type, here, so that we still know it after the event callback which might invalidate |
2233 | * the event. */ | |
2234 | saved_type = s->type; | |
2235 | ||
945c2931 | 2236 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
da7e457c LP |
2237 | r = source_set_pending(s, false); |
2238 | if (r < 0) | |
2239 | return r; | |
2240 | } | |
fd38203a | 2241 | |
6e9feda3 LP |
2242 | if (s->type != SOURCE_POST) { |
2243 | sd_event_source *z; | |
2244 | Iterator i; | |
2245 | ||
2246 | /* If we execute a non-post source, let's mark all | |
2247 | * post sources as pending */ | |
2248 | ||
2249 | SET_FOREACH(z, s->event->post_sources, i) { | |
2250 | if (z->enabled == SD_EVENT_OFF) | |
2251 | continue; | |
2252 | ||
2253 | r = source_set_pending(z, true); | |
2254 | if (r < 0) | |
2255 | return r; | |
2256 | } | |
2257 | } | |
2258 | ||
baf76283 LP |
2259 | if (s->enabled == SD_EVENT_ONESHOT) { |
2260 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2261 | if (r < 0) |
2262 | return r; | |
2263 | } | |
2264 | ||
12179984 | 2265 | s->dispatching = true; |
b7484e2a | 2266 | |
fd38203a LP |
2267 | switch (s->type) { |
2268 | ||
2269 | case SOURCE_IO: | |
2270 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2271 | break; | |
2272 | ||
6a0f1f6d | 2273 | case SOURCE_TIME_REALTIME: |
a8548816 | 2274 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2275 | case SOURCE_TIME_MONOTONIC: |
2276 | case SOURCE_TIME_REALTIME_ALARM: | |
2277 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2278 | r = s->time.callback(s, s->time.next, s->userdata); |
2279 | break; | |
2280 | ||
2281 | case SOURCE_SIGNAL: | |
2282 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2283 | break; | |
2284 | ||
08cd1552 LP |
2285 | case SOURCE_CHILD: { |
2286 | bool zombie; | |
2287 | ||
945c2931 | 2288 | zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 | 2289 | |
fd38203a | 2290 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2291 | |
2292 | /* Now, reap the PID for good. */ | |
2293 | if (zombie) | |
2294 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2295 | ||
fd38203a | 2296 | break; |
08cd1552 | 2297 | } |
fd38203a LP |
2298 | |
2299 | case SOURCE_DEFER: | |
2300 | r = s->defer.callback(s, s->userdata); | |
2301 | break; | |
da7e457c | 2302 | |
6e9feda3 LP |
2303 | case SOURCE_POST: |
2304 | r = s->post.callback(s, s->userdata); | |
2305 | break; | |
2306 | ||
6203e07a LP |
2307 | case SOURCE_EXIT: |
2308 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2309 | break; |
9d3e3aa5 LP |
2310 | |
2311 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2312 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2313 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2314 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2315 | } |
2316 | ||
12179984 LP |
2317 | s->dispatching = false; |
2318 | ||
55cbfaa5 DM |
2319 | if (r < 0) |
2320 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
8f5c235d | 2321 | strna(s->description), event_source_type_to_string(saved_type)); |
12179984 LP |
2322 | |
2323 | if (s->n_ref == 0) | |
2324 | source_free(s); | |
2325 | else if (r < 0) | |
6203e07a | 2326 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2327 | |
6203e07a | 2328 | return 1; |
fd38203a LP |
2329 | } |
2330 | ||
2331 | static int event_prepare(sd_event *e) { | |
2332 | int r; | |
2333 | ||
2334 | assert(e); | |
2335 | ||
2336 | for (;;) { | |
2337 | sd_event_source *s; | |
2338 | ||
2339 | s = prioq_peek(e->prepare); | |
baf76283 | 2340 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2341 | break; |
2342 | ||
2343 | s->prepare_iteration = e->iteration; | |
2344 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2345 | if (r < 0) | |
2346 | return r; | |
2347 | ||
2348 | assert(s->prepare); | |
12179984 LP |
2349 | |
2350 | s->dispatching = true; | |
fd38203a | 2351 | r = s->prepare(s, s->userdata); |
12179984 LP |
2352 | s->dispatching = false; |
2353 | ||
55cbfaa5 DM |
2354 | if (r < 0) |
2355 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2356 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a | 2357 | |
12179984 LP |
2358 | if (s->n_ref == 0) |
2359 | source_free(s); | |
2360 | else if (r < 0) | |
2361 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2362 | } |
2363 | ||
2364 | return 0; | |
2365 | } | |
2366 | ||
6203e07a | 2367 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2368 | sd_event_source *p; |
2369 | int r; | |
2370 | ||
2371 | assert(e); | |
2372 | ||
6203e07a | 2373 | p = prioq_peek(e->exit); |
baf76283 | 2374 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2375 | e->state = SD_EVENT_FINISHED; |
2376 | return 0; | |
2377 | } | |
2378 | ||
2379 | sd_event_ref(e); | |
2380 | e->iteration++; | |
6203e07a | 2381 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2382 | |
2383 | r = source_dispatch(p); | |
2384 | ||
2b0c9ef7 | 2385 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2386 | sd_event_unref(e); |
2387 | ||
2388 | return r; | |
2389 | } | |
2390 | ||
c2ba3ad6 LP |
2391 | static sd_event_source* event_next_pending(sd_event *e) { |
2392 | sd_event_source *p; | |
2393 | ||
da7e457c LP |
2394 | assert(e); |
2395 | ||
c2ba3ad6 LP |
2396 | p = prioq_peek(e->pending); |
2397 | if (!p) | |
2398 | return NULL; | |
2399 | ||
baf76283 | 2400 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2401 | return NULL; |
2402 | ||
2403 | return p; | |
2404 | } | |
2405 | ||
cde93897 LP |
2406 | static int arm_watchdog(sd_event *e) { |
2407 | struct itimerspec its = {}; | |
2408 | usec_t t; | |
2409 | int r; | |
2410 | ||
2411 | assert(e); | |
2412 | assert(e->watchdog_fd >= 0); | |
2413 | ||
2414 | t = sleep_between(e, | |
2415 | e->watchdog_last + (e->watchdog_period / 2), | |
2416 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2417 | ||
2418 | timespec_store(&its.it_value, t); | |
2419 | ||
75145780 LP |
2420 | /* Make sure we never set the watchdog to 0, which tells the |
2421 | * kernel to disable it. */ | |
2422 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2423 | its.it_value.tv_nsec = 1; | |
2424 | ||
cde93897 LP |
2425 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2426 | if (r < 0) | |
2427 | return -errno; | |
2428 | ||
2429 | return 0; | |
2430 | } | |
2431 | ||
2432 | static int process_watchdog(sd_event *e) { | |
2433 | assert(e); | |
2434 | ||
2435 | if (!e->watchdog) | |
2436 | return 0; | |
2437 | ||
2438 | /* Don't notify watchdog too often */ | |
2439 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2440 | return 0; | |
2441 | ||
2442 | sd_notify(false, "WATCHDOG=1"); | |
2443 | e->watchdog_last = e->timestamp.monotonic; | |
2444 | ||
2445 | return arm_watchdog(e); | |
2446 | } | |
2447 | ||
c45a5a74 TG |
2448 | _public_ int sd_event_prepare(sd_event *e) { |
2449 | int r; | |
fd38203a | 2450 | |
da7e457c LP |
2451 | assert_return(e, -EINVAL); |
2452 | assert_return(!event_pid_changed(e), -ECHILD); | |
2453 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2454 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2455 | |
6203e07a | 2456 | if (e->exit_requested) |
c45a5a74 | 2457 | goto pending; |
fd38203a LP |
2458 | |
2459 | e->iteration++; | |
2460 | ||
0be6c2f6 | 2461 | e->state = SD_EVENT_PREPARING; |
fd38203a | 2462 | r = event_prepare(e); |
0be6c2f6 | 2463 | e->state = SD_EVENT_INITIAL; |
fd38203a | 2464 | if (r < 0) |
c45a5a74 | 2465 | return r; |
fd38203a | 2466 | |
6a0f1f6d LP |
2467 | r = event_arm_timer(e, &e->realtime); |
2468 | if (r < 0) | |
c45a5a74 | 2469 | return r; |
6a0f1f6d | 2470 | |
a8548816 TG |
2471 | r = event_arm_timer(e, &e->boottime); |
2472 | if (r < 0) | |
c45a5a74 | 2473 | return r; |
a8548816 | 2474 | |
6a0f1f6d LP |
2475 | r = event_arm_timer(e, &e->monotonic); |
2476 | if (r < 0) | |
c45a5a74 | 2477 | return r; |
6a0f1f6d LP |
2478 | |
2479 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2480 | if (r < 0) |
c45a5a74 | 2481 | return r; |
fd38203a | 2482 | |
6a0f1f6d | 2483 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2484 | if (r < 0) |
c45a5a74 | 2485 | return r; |
fd38203a | 2486 | |
1b5995b0 | 2487 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2488 | goto pending; |
2489 | ||
2b0c9ef7 | 2490 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2491 | |
2492 | return 0; | |
2493 | ||
2494 | pending: | |
2b0c9ef7 | 2495 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2496 | r = sd_event_wait(e, 0); |
2497 | if (r == 0) | |
2b0c9ef7 | 2498 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2499 | |
2500 | return r; | |
c45a5a74 TG |
2501 | } |
2502 | ||
2503 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2504 | struct epoll_event *ev_queue; | |
2505 | unsigned ev_queue_max; | |
2506 | int r, m, i; | |
2507 | ||
2508 | assert_return(e, -EINVAL); | |
2509 | assert_return(!event_pid_changed(e), -ECHILD); | |
2510 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2511 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2512 | |
2513 | if (e->exit_requested) { | |
2514 | e->state = SD_EVENT_PENDING; | |
2515 | return 1; | |
2516 | } | |
6a0f1f6d | 2517 | |
1c724e9e | 2518 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2519 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2520 | |
15b38f93 | 2521 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2522 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2523 | if (m < 0) { |
c45a5a74 TG |
2524 | if (errno == EINTR) { |
2525 | e->state = SD_EVENT_PENDING; | |
2526 | return 1; | |
2527 | } | |
2528 | ||
2529 | r = -errno; | |
da7e457c LP |
2530 | goto finish; |
2531 | } | |
fd38203a | 2532 | |
e475d10c | 2533 | triple_timestamp_get(&e->timestamp); |
fd38203a LP |
2534 | |
2535 | for (i = 0; i < m; i++) { | |
2536 | ||
9da4cb2b | 2537 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2538 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
2539 | else { |
2540 | WakeupType *t = ev_queue[i].data.ptr; | |
2541 | ||
2542 | switch (*t) { | |
2543 | ||
2544 | case WAKEUP_EVENT_SOURCE: | |
2545 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2546 | break; | |
fd38203a | 2547 | |
9da4cb2b LP |
2548 | case WAKEUP_CLOCK_DATA: { |
2549 | struct clock_data *d = ev_queue[i].data.ptr; | |
2550 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2551 | break; | |
2552 | } | |
2553 | ||
2554 | case WAKEUP_SIGNAL_DATA: | |
2555 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2556 | break; | |
2557 | ||
2558 | default: | |
2559 | assert_not_reached("Invalid wake-up pointer"); | |
2560 | } | |
2561 | } | |
fd38203a | 2562 | if (r < 0) |
da7e457c | 2563 | goto finish; |
fd38203a LP |
2564 | } |
2565 | ||
cde93897 LP |
2566 | r = process_watchdog(e); |
2567 | if (r < 0) | |
2568 | goto finish; | |
2569 | ||
6a0f1f6d LP |
2570 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2571 | if (r < 0) | |
2572 | goto finish; | |
2573 | ||
e475d10c | 2574 | r = process_timer(e, e->timestamp.boottime, &e->boottime); |
a8548816 TG |
2575 | if (r < 0) |
2576 | goto finish; | |
2577 | ||
6a0f1f6d LP |
2578 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2579 | if (r < 0) | |
2580 | goto finish; | |
2581 | ||
2582 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2583 | if (r < 0) |
da7e457c | 2584 | goto finish; |
fd38203a | 2585 | |
e475d10c | 2586 | r = process_timer(e, e->timestamp.boottime, &e->boottime_alarm); |
fd38203a | 2587 | if (r < 0) |
da7e457c | 2588 | goto finish; |
fd38203a | 2589 | |
c2ba3ad6 | 2590 | if (e->need_process_child) { |
fd38203a LP |
2591 | r = process_child(e); |
2592 | if (r < 0) | |
da7e457c | 2593 | goto finish; |
fd38203a LP |
2594 | } |
2595 | ||
c45a5a74 TG |
2596 | if (event_next_pending(e)) { |
2597 | e->state = SD_EVENT_PENDING; | |
2598 | ||
2599 | return 1; | |
da7e457c LP |
2600 | } |
2601 | ||
c45a5a74 | 2602 | r = 0; |
fd38203a | 2603 | |
da7e457c | 2604 | finish: |
2b0c9ef7 | 2605 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2606 | |
2607 | return r; | |
fd38203a LP |
2608 | } |
2609 | ||
c45a5a74 TG |
2610 | _public_ int sd_event_dispatch(sd_event *e) { |
2611 | sd_event_source *p; | |
2612 | int r; | |
2613 | ||
2614 | assert_return(e, -EINVAL); | |
2615 | assert_return(!event_pid_changed(e), -ECHILD); | |
2616 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2617 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2618 | ||
2619 | if (e->exit_requested) | |
2620 | return dispatch_exit(e); | |
2621 | ||
2622 | p = event_next_pending(e); | |
2623 | if (p) { | |
2624 | sd_event_ref(e); | |
2625 | ||
2626 | e->state = SD_EVENT_RUNNING; | |
2627 | r = source_dispatch(p); | |
2b0c9ef7 | 2628 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2629 | |
2630 | sd_event_unref(e); | |
2631 | ||
2632 | return r; | |
2633 | } | |
2634 | ||
2b0c9ef7 | 2635 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2636 | |
2637 | return 1; | |
2638 | } | |
2639 | ||
34b87517 VC |
2640 | static void event_log_delays(sd_event *e) { |
2641 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; | |
34a6843d VC |
2642 | unsigned i; |
2643 | int o; | |
34b87517 VC |
2644 | |
2645 | for (i = o = 0; i < ELEMENTSOF(e->delays); i++) { | |
2646 | o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]); | |
2647 | e->delays[i] = 0; | |
2648 | } | |
34a6843d | 2649 | log_debug("Event loop iterations: %.*s", o, b); |
34b87517 VC |
2650 | } |
2651 | ||
c45a5a74 TG |
2652 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
2653 | int r; | |
2654 | ||
2655 | assert_return(e, -EINVAL); | |
2656 | assert_return(!event_pid_changed(e), -ECHILD); | |
2657 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2658 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 2659 | |
34b87517 VC |
2660 | if (e->profile_delays && e->last_run) { |
2661 | usec_t this_run; | |
2662 | unsigned l; | |
2663 | ||
2664 | this_run = now(CLOCK_MONOTONIC); | |
2665 | ||
2666 | l = u64log2(this_run - e->last_run); | |
2667 | assert(l < sizeof(e->delays)); | |
2668 | e->delays[l]++; | |
2669 | ||
2670 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { | |
2671 | event_log_delays(e); | |
2672 | e->last_log = this_run; | |
2673 | } | |
2674 | } | |
2675 | ||
c45a5a74 | 2676 | r = sd_event_prepare(e); |
53bac4e0 LP |
2677 | if (r == 0) |
2678 | /* There was nothing? Then wait... */ | |
2679 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2680 | |
34b87517 VC |
2681 | if (e->profile_delays) |
2682 | e->last_run = now(CLOCK_MONOTONIC); | |
2683 | ||
02d30981 | 2684 | if (r > 0) { |
53bac4e0 | 2685 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2686 | r = sd_event_dispatch(e); |
2687 | if (r < 0) | |
2688 | return r; | |
53bac4e0 LP |
2689 | |
2690 | return 1; | |
2691 | } | |
2692 | ||
2693 | return r; | |
c45a5a74 TG |
2694 | } |
2695 | ||
f7262a9f | 2696 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2697 | int r; |
2698 | ||
da7e457c LP |
2699 | assert_return(e, -EINVAL); |
2700 | assert_return(!event_pid_changed(e), -ECHILD); | |
2b0c9ef7 | 2701 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2702 | |
2703 | sd_event_ref(e); | |
fd38203a | 2704 | |
da7e457c | 2705 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2706 | r = sd_event_run(e, (uint64_t) -1); |
2707 | if (r < 0) | |
da7e457c | 2708 | goto finish; |
fd38203a LP |
2709 | } |
2710 | ||
6203e07a | 2711 | r = e->exit_code; |
da7e457c LP |
2712 | |
2713 | finish: | |
2714 | sd_event_unref(e); | |
2715 | return r; | |
fd38203a LP |
2716 | } |
2717 | ||
9b364545 TG |
2718 | _public_ int sd_event_get_fd(sd_event *e) { |
2719 | ||
2720 | assert_return(e, -EINVAL); | |
2721 | assert_return(!event_pid_changed(e), -ECHILD); | |
2722 | ||
2723 | return e->epoll_fd; | |
2724 | } | |
2725 | ||
f7262a9f | 2726 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2727 | assert_return(e, -EINVAL); |
2728 | assert_return(!event_pid_changed(e), -ECHILD); | |
2729 | ||
2730 | return e->state; | |
2731 | } | |
2732 | ||
6203e07a | 2733 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2734 | assert_return(e, -EINVAL); |
6203e07a | 2735 | assert_return(code, -EINVAL); |
da7e457c | 2736 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2737 | |
6203e07a LP |
2738 | if (!e->exit_requested) |
2739 | return -ENODATA; | |
2740 | ||
2741 | *code = e->exit_code; | |
2742 | return 0; | |
fd38203a LP |
2743 | } |
2744 | ||
6203e07a | 2745 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2746 | assert_return(e, -EINVAL); |
2747 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2748 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2749 | |
6203e07a LP |
2750 | e->exit_requested = true; |
2751 | e->exit_code = code; | |
2752 | ||
fd38203a LP |
2753 | return 0; |
2754 | } | |
46e8c825 | 2755 | |
6a0f1f6d | 2756 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2757 | assert_return(e, -EINVAL); |
2758 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2759 | assert_return(!event_pid_changed(e), -ECHILD); |
2760 | ||
e475d10c LP |
2761 | if (!TRIPLE_TIMESTAMP_HAS_CLOCK(clock)) |
2762 | return -EOPNOTSUPP; | |
2763 | ||
2764 | /* Generate a clean error in case CLOCK_BOOTTIME is not available. Note that don't use clock_supported() here, | |
2765 | * for a reason: there are systems where CLOCK_BOOTTIME is supported, but CLOCK_BOOTTIME_ALARM is not, but for | |
2766 | * the purpose of getting the time this doesn't matter. */ | |
3411372e LP |
2767 | if (IN_SET(clock, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM) && !clock_boottime_supported()) |
2768 | return -EOPNOTSUPP; | |
2769 | ||
e475d10c | 2770 | if (!triple_timestamp_is_set(&e->timestamp)) { |
38a03f06 LP |
2771 | /* Implicitly fall back to now() if we never ran |
2772 | * before and thus have no cached time. */ | |
2773 | *usec = now(clock); | |
2774 | return 1; | |
2775 | } | |
46e8c825 | 2776 | |
e475d10c | 2777 | *usec = triple_timestamp_by_clock(&e->timestamp, clock); |
46e8c825 LP |
2778 | return 0; |
2779 | } | |
afc6adb5 LP |
2780 | |
2781 | _public_ int sd_event_default(sd_event **ret) { | |
2782 | ||
ec202eae | 2783 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2784 | sd_event *e = NULL; |
afc6adb5 LP |
2785 | int r; |
2786 | ||
2787 | if (!ret) | |
2788 | return !!default_event; | |
2789 | ||
2790 | if (default_event) { | |
2791 | *ret = sd_event_ref(default_event); | |
2792 | return 0; | |
2793 | } | |
2794 | ||
2795 | r = sd_event_new(&e); | |
2796 | if (r < 0) | |
2797 | return r; | |
2798 | ||
2799 | e->default_event_ptr = &default_event; | |
2800 | e->tid = gettid(); | |
2801 | default_event = e; | |
2802 | ||
2803 | *ret = e; | |
2804 | return 1; | |
2805 | } | |
2806 | ||
2807 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2808 | assert_return(e, -EINVAL); | |
2809 | assert_return(tid, -EINVAL); | |
76b54375 | 2810 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2811 | |
76b54375 LP |
2812 | if (e->tid != 0) { |
2813 | *tid = e->tid; | |
2814 | return 0; | |
2815 | } | |
2816 | ||
2817 | return -ENXIO; | |
afc6adb5 | 2818 | } |
cde93897 LP |
2819 | |
2820 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2821 | int r; | |
2822 | ||
2823 | assert_return(e, -EINVAL); | |
8f726607 | 2824 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2825 | |
2826 | if (e->watchdog == !!b) | |
2827 | return e->watchdog; | |
2828 | ||
2829 | if (b) { | |
2830 | struct epoll_event ev = {}; | |
cde93897 | 2831 | |
09812eb7 LP |
2832 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2833 | if (r <= 0) | |
cde93897 | 2834 | return r; |
cde93897 LP |
2835 | |
2836 | /* Issue first ping immediately */ | |
2837 | sd_notify(false, "WATCHDOG=1"); | |
2838 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2839 | ||
2840 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2841 | if (e->watchdog_fd < 0) | |
2842 | return -errno; | |
2843 | ||
2844 | r = arm_watchdog(e); | |
2845 | if (r < 0) | |
2846 | goto fail; | |
2847 | ||
2848 | ev.events = EPOLLIN; | |
2849 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2850 | ||
2851 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2852 | if (r < 0) { | |
2853 | r = -errno; | |
2854 | goto fail; | |
2855 | } | |
2856 | ||
2857 | } else { | |
2858 | if (e->watchdog_fd >= 0) { | |
2859 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2860 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2861 | } |
2862 | } | |
2863 | ||
2864 | e->watchdog = !!b; | |
2865 | return e->watchdog; | |
2866 | ||
2867 | fail: | |
03e334a1 | 2868 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2869 | return r; |
2870 | } | |
8f726607 LP |
2871 | |
2872 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2873 | assert_return(e, -EINVAL); | |
2874 | assert_return(!event_pid_changed(e), -ECHILD); | |
2875 | ||
2876 | return e->watchdog; | |
2877 | } | |
60a3b1e1 LP |
2878 | |
2879 | _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) { | |
2880 | assert_return(e, -EINVAL); | |
2881 | assert_return(!event_pid_changed(e), -ECHILD); | |
2882 | ||
2883 | *ret = e->iteration; | |
2884 | return 0; | |
2885 | } |